CN116586400A - Thermal reaction red mud pretreatment process and horizontal spiral thermal reaction kettle - Google Patents

Thermal reaction red mud pretreatment process and horizontal spiral thermal reaction kettle Download PDF

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Publication number
CN116586400A
CN116586400A CN202310547891.1A CN202310547891A CN116586400A CN 116586400 A CN116586400 A CN 116586400A CN 202310547891 A CN202310547891 A CN 202310547891A CN 116586400 A CN116586400 A CN 116586400A
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cylinder body
red mud
temperature
inner cylinder
preheating
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周军
朱兆鸿
廖超
冯勇
严键
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Sichuan Provincial Chuanji Engineering Technology Co ltd
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Sichuan Provincial Chuanji Engineering Technology Co ltd
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B1/00—Preliminary treatment of ores or scrap
    • C22B1/02—Roasting processes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
    • B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
    • B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
    • B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
    • B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
    • B09B3/30—Destroying solid waste or transforming solid waste into something useful or harmless involving mechanical treatment
    • B09B3/35—Shredding, crushing or cutting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
    • B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
    • B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
    • B09B3/40—Destroying solid waste or transforming solid waste into something useful or harmless involving thermal treatment, e.g. evaporation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
    • B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
    • B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
    • B09B3/70—Chemical treatment, e.g. pH adjustment or oxidation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
    • B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
    • B09B2101/00—Type of solid waste
    • B09B2101/55—Slag

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  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Metallurgy (AREA)
  • Physics & Mathematics (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Manufacturing & Machinery (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Organic Chemistry (AREA)
  • Geology (AREA)
  • Thermal Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Treatment Of Sludge (AREA)

Abstract

The application discloses a thermal reaction red mud pretreatment process and a horizontal spiral thermal reaction kettle, wherein the process comprises the following steps: s1: performing flame-proof type preheating treatment on the mixed material through a first roasting area of a roasting device, and controlling the preheating temperature to be 600-1000 ℃; the mixed material comprises red mud and a modifying agent; s2: and (3) carrying out flame-proof reduction roasting on the material through a second roasting area of the roasting device, and controlling the roasting temperature to be 1200-1400 ℃ to convert ferric oxide in the red mud into ferroferric oxide. The roasting device is a horizontal spiral thermal reaction kettle, can perform flame-proof thermal treatment on materials, and effectively prevents sulfur-and nitrogen-containing flue gas generated by combustion from contacting with the materials when the materials are heated, so that the materials are polluted, and sulfur-and nitrogen-containing compound impurities are formed.

Description

Thermal reaction red mud pretreatment process and horizontal spiral thermal reaction kettle
Technical Field
The application relates to the technical field of red mud recovery treatment, in particular to a thermal reaction red mud pretreatment process and a horizontal spiral thermal reaction kettle.
Background
The red mud is tailings produced in the aluminum industry production process, has complex mineral composition and mainly contains Al 2 O 3 、Fe 2 O 3 、SiO 2 Equiminerals, generally exhibit a strong alkalinity and corrosiveness. Typically on average 1 ton of alumina is produced, with 1.0-2.0 tons of red mud being produced.
The red mud is rich in iron, aluminum, calcium, silicon, titanium, sodium, nickel, manganese, chromium, vanadium and scandium, yttrium and lanthanide rare earth elements, and can change waste into valuable and become benefit through comprehensive development and utilization, and especially under the condition of increasingly lacking mineral resources, the recovery of valuable metals in the red mud is increasingly important. How to develop and utilize the red mud with a lot of alarming and falling asleep for years truly realizes the modern production without tail, waste and secondary pollution, achieves the comprehensive treatment of the mine environment, is an important subject of common concern in China and countries around the world, and has very important practical significance in developing and utilizing the red mud.
In the prior art, ferric oxide in red mud is reduced into magnetic ferroferric oxide through a high-temperature reduction reaction, and then the ferroferric oxide is separated through a magnetic separator to obtain magnetic fine iron powder. However, in the existing treatment process, red mud and a reactant are placed in a rotary kiln, flame generated by a burner is internally heated, and the fuel of the existing burner is usually pulverized coal, and flue gas containing sulfur dioxide and nitrogen dioxide is generated when the flame generated by the burner contacts with mineral materials in the red mud, so that sulfur-containing and nitrogen-containing compounds are generated, the separation difficulty of various subsequent mineral materials is increased, and the recovery rate of metal mineral materials is reduced.
Disclosure of Invention
In order to solve the problems in the prior art, the application provides a thermal reaction red mud pretreatment process and a horizontal spiral thermal reaction kettle
In order to achieve the above purpose, the technical scheme adopted by the application is as follows:
the heat reaction red mud pretreatment process is characterized by comprising the following steps:
s1: performing flame-proof preheating treatment on the mixed material, and controlling the preheating temperature to be 600-1000 ℃ to enable the temperature of the mixed material to be more than 600 ℃; the mixed material comprises red mud and a modifying agent;
s2: and (3) carrying out flame-proof reduction roasting on the materials, wherein the roasting temperature is controlled to be 1200-1400 ℃ so as to convert ferric oxide in the red mud into ferroferric oxide.
Preferably, the modifying agent comprises a reducing agent and a catalyst;
the reducing agent is used for reducing ferric oxide in the red mud at high temperature;
the catalyst is used for accelerating the reduction reaction of the ferric oxide in the red mud.
Preferably, the thermal reaction red mud pretreatment process is characterized in that,
and (2) sending the red mud and the modifying agent into a mixer to obtain a mixed material, and then carrying out the step (S1).
Preferably, the thermal reaction red mud pretreatment process is characterized in that the red mud is crushed into 60-mesh fine particles before the flame-proof type preheating treatment.
The utility model provides a horizontal spiral thermal reaction cauldron, its characterized in that includes:
an inner cylinder body with a feed inlet and a discharge outlet;
an outer cylinder;
a burner having a flame outlet;
a transmission device;
a lifting plate;
the inner wall of the inner cylinder body is provided with a lifting blade which is connected with the inner wall of the inner cylinder body;
the transmission device is connected with the inner cylinder body and can drive the inner cylinder body to rotate along the axis of the inner cylinder body;
the inner cylinder body is positioned in the outer cylinder body, and an annular cavity is formed between the outer cylinder body and the inner cylinder body;
the fire outlet of the burner is connected with the outer cylinder body and extends into the annular cavity.
Preferably, the inner cylinder body comprises a preheating section and a high-temperature section, the temperature in the cylinder body of the preheating section can reach 600-1000 ℃, and the temperature in the cylinder body of the high-temperature section can reach 1200-1400 ℃.
Preferably, the inner wall of the outer cylinder body is provided with refractory materials.
Preferably, the refractory material is 1260 fiber module.
Preferably, the diameter of the inner cylinder body is 2-2.5 m, and the length is 20-25 m.
Preferably, the preheating section is an inner cylinder inner region of which one end, close to the feeding port, of the inner cylinder extends for 4 meters along the axis of the inner cylinder; the high temperature section is an inner cylinder inner region except the preheating section.
Preferably, the burner comprises a preheating burner and a high-temperature burner, wherein the preheating burner is used for heating the preheating section, and the high-temperature burner is used for heating the high-temperature section, so that the temperature of the preheating section reaches 600-1000 ℃ and the temperature of the high-temperature section reaches 1200-1400 ℃.
Preferably, the number of the preheating combustors is at least 1, and the number of the high-temperature combustors is more than 2.
Preferably, the horizontal spiral propulsion thermal reaction device is characterized by further comprising:
a connecting shaft;
a spiral sheet;
a second motor;
the connecting shaft is positioned in the inner cylinder body and is movably connected with two ends of the inner cylinder body;
the spiral piece is arranged around the connecting shaft;
one end of the connecting shaft extends out of the outer cylinder and is connected with the second motor;
the second motor is arranged at one end of the outer cylinder body and can drive the connecting shaft to rotate.
Preferably, the horizontal spiral thermal reaction kettle is characterized in that,
further comprises:
a smoke chamber;
the smoke chamber is in communication with the annular cavity.
The beneficial effects of the application are as follows:
according to the thermal reaction red mud pretreatment process provided by the application, the horizontal spiral thermal reaction kettle is used for carrying out flame-proof thermal treatment on the materials, so that the pollution to the materials caused by the contact of sulfur-and nitrogen-containing flue gas generated by combustion and the materials when the materials are heated is effectively prevented, and sulfur-and nitrogen-containing compound impurities are formed, so that various metals in the subsequent red mud mineral materials are easier to separate, and the recovery rate of the mineral materials is improved.
Meanwhile, the existing reaction kettle can enter the next stage after the material passes through the cooling area, if the material is subjected to subsequent heating treatment, a large amount of energy sources are consumed to increase the temperature of the material, and the process only preheats and heats the material through the horizontal spiral heat reaction kettle, so that the treated mineral aggregate does not need to be cooled, directly flows into the next reaction equipment to perform high-temperature reaction, the mineral aggregate treatment time is shortened, and the energy source consumption of subsequent red mud treatment is greatly reduced.
Description of the drawings:
FIG. 1 is a flow chart of a thermal reaction red mud pretreatment process;
FIG. 2 is a schematic structural view of a horizontal spiral thermal reactor;
FIG. 3 is an enlarged partial schematic view a of an internal cross-sectional view of a horizontal spiral thermal reactor;
FIG. 4 is a schematic cross-sectional view of a horizontal spiral thermal reactor;
FIG. 5 is an enlarged partial schematic view b of an internal cross-sectional view of a horizontal spiral thermal reactor;
FIG. 6 is a partially enlarged schematic view of a discharge port of a horizontal spiral thermal reactor;
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
Referring to fig. 1-6, the following specific embodiments are provided in the present application:
example 1
The thermal reaction red mud pretreatment process is characterized by comprising the following steps of:
s1: performing flame-proof preheating treatment on the mixed material, and controlling the preheating temperature to be 600-1000 ℃ to enable the temperature of the mixed material to be more than 600 ℃; the mixed material comprises red mud and a modifying agent;
s2: the material is subjected to flame-proof high-temperature reduction roasting, the roasting temperature is controlled to be 1200-1400 ℃, the temperature of the mixed material is enabled to reach more than 1200 ℃, and ferric oxide in the red mud is converted into ferroferric oxide.
Considering that the recycling of red mud at present mainly reduces ferric oxide in the red mud into magnetic ferroferric oxide through a high-temperature reduction reaction, and then the ferroferric oxide is separated through a magnetic separator to obtain magnetic fine iron powder, but the current treatment process is to place the red mud and a reaction agent in a rotary kiln, and heat the red mud and the reaction agent internally through flame generated by a burner, wherein fuel of the existing burner is usually coal dust, flue gas containing sulfur dioxide and nitrogen dioxide is generated while the burner generates flame, and sulfur-containing and nitrogen-containing compounds are generated after the flue gas contacts with mineral aggregates in the red mud, so that the separation difficulty of various subsequent mineral aggregates is increased, and the recovery rate of metal mineral aggregates is reduced.
In the actual production process, firstly, red mud and a modifying agent enter a roasting device to be preheated (the preheating temperature is controlled to be 600-1000 ℃ so that the flow temperature of the mixture can reach above 600 ℃), then, red mud and the modifying agent are subjected to high-temperature reduction roasting (the high-temperature reduction roasting temperature is controlled to be 1200-1400 ℃ so that the temperature of the mixture reaches above 1200 ℃), and ferric oxide in the red mud is subjected to reduction reaction to generate ferroferric oxide, so that the pretreatment of the red mud is completed. The roasting device used in the method can be a horizontal spiral thermal reaction kettle provided by the application.
Because the whole process is flame-proof heat treatment, the material is not contacted with flame and smoke, so that the smoke containing sulfur and nitrogen generated by fuel combustion is effectively prevented from contacting with the material when the roasting device heats the material, the pollution to the material is caused, and sulfur-containing and nitrogen-containing compound impurities are formed, so that various metals in the subsequent red mud mineral aggregate are easier to separate, and the mineral aggregate recovery rate is improved.
Example 2
In this embodiment, as a further improvement of the technical scheme of embodiment 1, the modified agent includes a reducing agent and a catalyst;
the reducing agent is used for reducing ferric oxide in the red mud at high temperature;
the catalyst is used for accelerating the reduction reaction of the ferric oxide in the red mud.
In the embodiment, the modifying agent is selected as a reducing agent and a catalyst, so that the red mud is subjected to reduction reaction in a reducing atmosphere to generate ferroferric oxide when reacting in a roasting device, and the reduction reaction speed is further increased through the catalyst.
Example 3
In this embodiment, as a further improvement of the technical scheme of embodiment 1, the method is characterized in that red mud and a modifying agent are fed into a mixer to obtain a mixed material, and then the step S1 is performed.
In the embodiment, the red mud and the modifying agent are sent into the mixer to be fully and uniformly mixed, and then the materials are sent into the roasting device (reaction kettle) to be subjected to heat treatment, so that the modifying agent and the red mud entering the roasting device are distributed more uniformly, and the heat treatment efficiency is effectively improved.
Preferably, the red mud is crushed into 60-mesh fine particles and then fed into a mixer for mixing.
Considering that after ferric oxide in red mud is reduced to ferroferric oxide, the ferroferric oxide is further separated by a magnetic separator, but mineral aggregate with the fineness of more than 60 meshes can be sent to the magnetic separator for separation. Therefore, in the embodiment, the red mud ore materials are crushed into 60-mesh fine crushed particles, then the steps of subsequent mixing, heat treatment and the like are carried out, the fine crushed red mud ore materials are fully mixed with the modifying agent, the reduction reaction efficiency and the generation rate of ferroferric oxide are effectively improved, and meanwhile, the size of ore particles is ensured to meet the requirement of subsequent magnetic separation.
Example 4
A horizontal spiral thermal reactor, comprising:
an inner cylinder (1) with a feed inlet (101) and a discharge outlet (102);
an outer cylinder (2);
a burner (3) having a flame outlet (301);
a transmission (4);
a lifting plate (5);
the lifting plate (5) is connected to the inner wall of the inner cylinder body (1);
the transmission device (4) is connected with the inner cylinder body (1) and can drive the inner cylinder body (1) to rotate along the axis of the inner cylinder body (1).
The inner cylinder (1) is positioned inside the outer cylinder (2), and an annular cavity (6) is formed between the outer cylinder (2) and the inner cylinder (1);
the fire outlet (301) of the burner (3) is connected with the outer cylinder (2) and extends into the annular cavity (6).
In consideration of the conventional heating method of the thermal reactor, the medium such as water or oil is heated by means of boiler heating, electric heating or the like, and then the heated medium such as water or oil is injected into the jacket of the reactor, so that the reactant of the reactor reaches the required temperature through heat transfer, but the highest temperature which can be reached by the medium is limited (not more than 600 ℃). Therefore, when the reactant needs to reach a temperature of 1200 ℃ or higher, the reactant needs to be placed in the rotary kiln and heated by flame. The current heating mode of the rotary kiln is usually kiln internal heating, flame generated by a burner (3) is directly sprayed into the kiln, so that generated sulfur dioxide, nitrogen dioxide and other gases after fuel combustion are in contact with reactants, the reactants are polluted, and the final reaction result cannot be expected.
The horizontal spiral thermal reaction kettle provided by the embodiment comprises an inner cylinder body (1) and an outer cylinder body (2), an annular cavity (6) is formed between the inner cylinder body (1) and the outer cylinder body (2), a fire outlet (301) of a combustor (3) extends into the annular cavity (6) from the outer cylinder body (2), when reactants in the cylinder body need to be heated, flames generated by the combustor (3) can be sprayed into the annular cavity (6) to heat the inner cylinder body (1), the reactants reach the required temperature in the inner cylinder body (1) through a heat transfer mode, meanwhile, the inner cylinder body (1) can be driven by a transmission device (4) to rotate along the axis of the inner cylinder body, a lifting plate (5) in the cylinder body can drive the reactants to rotate, and when the device is installed and used, one end position where a feed inlet of the device is located is higher than one end where the discharge outlet of the device is located, so that the reactants are affected by gravity and can gradually move towards the discharge outlet (102), and smoke generated through fuel combustion can be discharged out of the reaction kettle along the annular cavity (6), so that the smoke pollution to the reactants can be effectively avoided, and the smoke pollution to heat the reaction kettle is effectively avoided, and the reaction kettle is realized.
In addition, red mud needs to be subjected to multiple material extractions for the purpose of harmless treatment (no emission of harmful substances), and the process flow is long. In a longer process flow, each process link needs to face the process uncertainty factors such as manual access, all-weather operation shift switching and the like, namely the consistency of the output materials of different groups, different material batches and the like after the same process treatment is not high. This presents challenges for mass production standardization of the process. The embodiment of the application adopts a mode of heating the flame outer cylinder, so that on one hand, flame combustion flue gas is prevented from participating in the reaction, a thermal reaction temperature link and heat supply are improved, and on the other hand, the application also provides more efficient and effective adjustability relative to a preheating medium heating mode. The adjustment behavior can be generated under the intervention conditions of entering different material batches, switching and the like, and guarantees are provided for effective production of the process link. For example, the moisture content of the inlet materials is not the same, and may change many times in one day, and if the materials are heated at the same temperature to perform thermal reaction, the materials may be hardened, and the thermal reaction effect may be seriously affected.
Preferably, the horizontal spiral propulsion thermal reaction device is characterized by further comprising:
a connecting shaft (10);
a spiral sheet (11);
a second motor (12);
the connecting shaft (10) is positioned in the inner cylinder and is movably connected with two ends of the inner cylinder;
the spiral sheet (11) is arranged around the connecting shaft (10);
one end of the connecting shaft (10) extends out of the outer cylinder and is connected with the second motor (12)
Connecting;
the second motor (12) is arranged at one end of the outer cylinder body and can drive the connecting shaft (10) to rotate.
The connecting shaft and the spiral sheet are arranged in the inner cylinder body, the connecting shaft and the spiral sheet are driven to rotate by the second motor arranged outside, and the material falling above the spiral sheet can be driven to move from the feeding hole to the discharging hole at a high speed by combining the spiral sheet of the lifting plate, so that the transfer efficiency of the material is effectively improved.
Example 5
In this embodiment, as a further improvement of the technical solution of embodiment 4, it is characterized in that,
the inner cylinder body (1) comprises a preheating section (7) and a high-temperature section (8), the temperature in the preheating section (7) cylinder body can reach 600-1000 ℃, and the temperature in the high-temperature section (8) cylinder body can reach 1200-1400 ℃.
Considering that the heat treatment of the red mud comprises a preheating stage and a high-temperature reduction stage, the embodiment divides the inner cylinder (1) into a preheating section (7) and a high-temperature section (8), so that the temperature in the cylinder of the preheating section (7) can reach 600-1000 ℃, the temperature in the cylinder of the high-temperature section (8) can reach 1200-1400 ℃, the temperature of the red mud mineral aggregate can reach above 600 ℃ in the preheating stage, and the temperature of the red mud mineral aggregate can reach above 1200 ℃ in the high-temperature reduction stage.
Through setting up preheating section and high temperature section, preheating section temperature adjustable range sets up great (high low temperature span 400 degrees centigrade), can carry out the adaptability adjustment to the material of different parameters of different batches, avoids the material to harden or heat insufficient problem under same temperature parameter to ensure that the material evenly intensifies, steam evenly evaporates fast, provides the material that is heated evenly, fully for the thermal reaction of follow-up high temperature section, and granule dispersion easily compounding reversal.
Meanwhile, the existing reaction kettle generally needs to enable materials to enter the next stage after passing through a cooling zone, if the materials are subjected to subsequent heating treatment, a large amount of energy sources are consumed to improve the temperature of the materials, and in the embodiment, the red mud subjected to the heat treatment also needs to flow into next-stage equipment to perform high Wen Liebian reaction aiming at the treatment process flow of the red mud, so that the reaction kettle is only provided with a preheating zone and a high-temperature zone, and after the materials are subjected to the preheating and high-temperature heat treatment, mineral materials do not need to be cooled and directly flow into the next-stage reaction equipment to perform the high-temperature reaction, so that the mineral material treatment time is shortened, and the subsequent red mud treatment energy consumption is greatly reduced.
Example 6
In this embodiment, as a further improvement of the technical scheme of embodiment 5, it is characterized in that,
the inner wall of the outer cylinder body (2) is provided with a refractory material.
Considering that the reaction kettle cylinder is usually made of metal, the heat conductivity of the reaction kettle cylinder is higher, when flame generated by the burner (3) enters the annular cavity (6), the outer cylinder (2) also absorbs heat, the reaction kettle only needs the inner cylinder (1) to absorb heat and transfer the heat to reactants, the outer cylinder (2) is directly contacted with the flame to cause energy waste, and the outer cylinder (2) has too high temperature to generate potential safety hazards. Therefore, the refractory material is arranged on the inner side of the outer cylinder body (2), so that the transmission of heat to the outer cylinder body (2) is effectively reduced, the energy loss in the heating process of the reaction kettle is reduced, and the safety of the reaction kettle is improved.
Preferably, the refractory material is 1260 fiber module.
The 1260 fiber module selected in the embodiment is used as a refractory material, has low heat conductivity and heat capacity, obvious heat insulation and energy saving effects and low volume weight, greatly reduces the steel structure load of the kiln during actual installation, reduces the consumption of the steel structure by the kiln, and reduces engineering cost to a certain extent.
Example 7
In this embodiment, as a further improvement of the technical scheme of embodiment 5, it is characterized in that,
the diameter of the inner cylinder body (1) is 2-2.5 meters, and the length is 20-25 meters;
the preheating section (7) is an inner region of the inner cylinder (1) which is close to one end of the inner cylinder (1) of the feed inlet (101) and extends for 4 meters along the axis of the inner cylinder (1); the high temperature section (8) is an inner region of the inner cylinder (1) except the preheating section (7).
The size of the reaction kettle is further set, the diameter of the inner cylinder body (1) is set to be 2-2.5 meters, and the length of the inner cylinder body is set to be 20-25 meters, so that the treatment capacity of 1000 tons of red mud treated per day can be met, meanwhile, the first 4 meters of the inner cylinder body (1) is set to be a preheating section (7), and the other is set to be a high-temperature section (8), so that the reaction time and the temperature requirement of the red mud heat treatment can be met.
Example 8
In this embodiment, as a further improvement of the technical solution of embodiment 7, it is characterized in that,
the combustor (3) comprises a preheating combustor (3) and a high-temperature combustor (3), the preheating combustor (3) is used for heating the preheating section (7), the high-temperature combustor (3) is used for heating the high-temperature section (8), the temperature of the preheating section (7) is enabled to reach 600-1000 ℃, and the temperature of the high-temperature section (8) is enabled to reach 1200-1400 ℃.
Considering that the temperature of the high temperature section (8) of the reaction kettle needs to reach 1200-1400 ℃, and the temperature of the preheating section (7) only needs to reach 600-1000 ℃, therefore, the preheating burner (3) is configured in the preheating section (7) of the reaction kettle, the high temperature burner (3) is configured in the high temperature section (8), the power of the preheating burner (3) can be set to be smaller than that of the high temperature burner (3) or the preheating burner (3) can be set to be intermittently combusted so as to realize that the heat supply of the preheating section (7) is smaller than that of the high temperature section (8), the temperature of the preheating section (7) is kept at 600-1000 ℃, and the temperature of the high temperature section (8) reaches 1200-1400 ℃.
Preferably, the number of the preheating combustors (3) is at least 1, and the number of the high-temperature combustors (3) is more than 2.
Considering that the length of the inner cylinder body (1) of the reaction kettle is larger and reaches more than 20 meters, when the reaction kettle is heated from the side of the cylinder body, flames generated by a single combustor (3) cannot cover the high-temperature section (8), so that the inner cylinder body (1) is heated unevenly and the temperatures of different positions of the cylinder body are different, the preheating combustors (3) are at least 1, the number of the high-temperature combustors (3) is more than 2, and the heating uniformity of the combustor (3) to the inner cylinder body (1) is ensured.
The multiple combustors may also be configured for independent temperature control use, i.e., the output power of each combustor may be independently configured. The use of this embodiment can make the inner tube form the temperature ladder from feeding to ejection of compact, and each temperature ladder difference in temperature is not big, and the combustor that is located the interlude can be used for providing preheating section to the temperature switching of high temperature section, and when the material humidity is too high in entrance is unsuitable for preheating of high temperature fast, the temperature that preheating section used is lower generally, if directly gets into the high temperature section, also can have the condition of preheating deficiency. By means of an independently configured multi-burner operating scheme, the intermediate burner can achieve a transition from the preheating section to the high temperature section, which essentially is also understood as an adjustable configuration of the preheating and high temperature zone functions of the intermediate section. It should be noted that when the middle-stage burner is adjusted to compensate for insufficient heating of the preheating-stage materials, the power of the high-temperature-stage burner should be relatively increased to the high-temperature value side of the high-temperature stage so as to compensate for insufficient reaction of the high-temperature stage after the power adjustment of the middle-stage burner. In practice, the effect is obvious, so that the influence of shift change and batch parameters of materials is solved, the consistency of the whole process discharging is high, and the industrial effect of mass production is obvious.
Example 9
In this embodiment, as a further improvement of the technical solutions of embodiments 4 to 8, it is characterized in that,
is characterized in that the method comprises the steps of,
further comprises:
a smoke chamber (9);
the smoke chamber is communicated with the annular cavity (6) and is used for discharging smoke generated by combustion.
The embodiment is provided with the smoke chamber which is communicated with the annular cavity (6) and can be used for containing smoke generated by combustion matters, and the smoke can be discharged after being purified later, so that the pollution to the environment is reduced.
In some embodiments, an exhaust fan is provided at one end of the smoke chamber, the exhaust fan being configured to draw water vapor generated by combustion away from the smoke, preventing the water vapor from lowering the reaction temperature in the annular cavity.
In describing embodiments of the present application, it is to be understood that terms "upper", "lower", "front", "rear", "left", "right", "horizontal", "center", "top", "bottom", "inner", "outer", and the like indicate an azimuth or positional relationship.
In describing embodiments of the present application, it should be noted that the terms "mounted," "connected," and "assembled" are to be construed broadly, as they may be fixedly connected, detachably connected, or integrally connected, unless otherwise specifically indicated and defined; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present application will be understood in specific cases by those of ordinary skill in the art.
In the description of embodiments of the application, a particular feature, structure, material, or characteristic may be combined in any suitable manner in one or more embodiments or examples.
In the description of the embodiments of the present application, it is to be understood that "-" and "-" denote the same ranges of the two values, and the ranges include the endpoints. For example: "A-B" means a range greater than or equal to A and less than or equal to B. "A-B" means a range of greater than or equal to A and less than or equal to B.
In the description of embodiments of the present application, the term "and/or" is merely an association relationship describing an association object, meaning that three relationships may exist, e.g., a and/or B, may represent: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.
Although embodiments of the present application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the application, the scope of which is defined in the appended claims and their equivalents.

Claims (10)

1. The thermal reaction red mud pretreatment process is characterized by comprising the following steps of:
s1: performing flame-proof preheating treatment on the mixed material, and controlling the preheating temperature to be 600-1000 ℃ to enable the temperature of the mixed material to be more than 600 ℃; the mixed material comprises red mud and a modifying agent;
s2: and (3) carrying out flame-proof reduction roasting on the materials, wherein the roasting temperature is controlled to be 1200-1400 ℃ so as to convert ferric oxide in the red mud into ferroferric oxide.
2. The thermal red mud pretreatment process according to claim 1, wherein the modifying agent comprises a reducing agent and a catalyst;
the reducing agent is used for reducing ferric oxide in the red mud at high temperature;
the catalyst is used for accelerating the reduction reaction of the ferric oxide in the red mud.
3. The thermal reaction red mud pretreatment process according to claim 1, wherein the red mud is crushed into 60 mesh fine particles before the muffle type preheating treatment.
4. A thermally reactive red mud pretreatment process as claimed in claim 3, wherein,
and (2) sending the red mud and the modifying agent into a mixer to obtain a mixed material, and then carrying out the step (S1).
5. A horizontal spiral thermal reactor, comprising:
an inner cylinder body with a feed inlet and a discharge outlet;
an outer cylinder;
a burner having a flame outlet;
a transmission device;
a lifting plate;
the lifting plate is connected to the inner wall of the inner cylinder body;
the transmission device is connected with the inner cylinder body and can drive the inner cylinder body to rotate along the axis of the inner cylinder body;
the inner cylinder body is positioned in the outer cylinder body, and an annular cavity is formed between the outer cylinder body and the inner cylinder body;
the fire outlet of the burner is connected with the outer cylinder body and extends into the annular cavity.
6. The horizontal spiral thermal reactor according to claim 5, wherein,
the inner cylinder body comprises a preheating section and a high-temperature section, the preheating section enables the temperature in the cylinder body to reach 600-1000 ℃, and the high-temperature section enables the temperature in the cylinder body to reach 1200-1400 ℃.
7. The horizontal spiral thermal reactor according to claim 6, wherein,
the inner wall of the outer cylinder body is provided with a refractory material.
8. The horizontal spiral thermal reactor of claim 6, wherein the inner cylinder has a diameter of 2-2.5 m and a length of 20-25 m.
9. A horizontal screw propulsion thermal reaction apparatus as claimed in claim 1 further comprising:
a connecting shaft;
a spiral sheet;
a second motor;
the connecting shaft is positioned in the inner cylinder body and is movably connected with two ends of the inner cylinder body;
the spiral piece is arranged around the connecting shaft;
one end of the connecting shaft extends out of the outer cylinder and is connected with the second motor;
the second motor is arranged at one end of the outer cylinder body and can drive the connecting shaft to rotate.
10. The horizontal spiral thermal reactor according to claim 9, wherein,
at least 1 preheating burner, and more than 2 high-temperature burners.
CN202310547891.1A 2023-05-16 2023-05-16 Thermal reaction red mud pretreatment process and horizontal spiral thermal reaction kettle Pending CN116586400A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310547891.1A CN116586400A (en) 2023-05-16 2023-05-16 Thermal reaction red mud pretreatment process and horizontal spiral thermal reaction kettle

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310547891.1A CN116586400A (en) 2023-05-16 2023-05-16 Thermal reaction red mud pretreatment process and horizontal spiral thermal reaction kettle

Publications (1)

Publication Number Publication Date
CN116586400A true CN116586400A (en) 2023-08-15

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Family Applications (1)

Application Number Title Priority Date Filing Date
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Country Status (1)

Country Link
CN (1) CN116586400A (en)

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